Guitar neck



FIG. 1 is a side view of a guitar neck showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a bottom perspective view thereof; and,

FIG. 4 is a top end view taken from upper end thereof.

The broken lines shown throughout the view represent the portions of the design which form no part of the claim. 

I claim, the ornamental design for a guitar neck, as shown and described. 